Ext JS 2.0.2 is still available for download under a LGPL licence and can be used with the GWT integration found in the GWT-Ext project (not to be confused with Ext GWT). i.e. GWT-Ext 2.0.3 and Ext 2.0.2 are still both LGPL. I wonder if Ext GWT 1.0 (GPL) started life as GWT-Ext 2.0.3 (LGPL)…

Click with OpenRico. A simple and effective however there are some gaps for more complex flows. Some good OpenRico examples for simple DHTML effects and AJAX.

Wicket. More complicated than Click and generates less HTML for you. However, it would work well with Web designers – templates are valid XHTML. I like it but the documentation leaves something to be desired.